for example, in a user group, a user can belong to multiple groups, and multiple users in a group need to do bidirectional caching because they need to obtain groupSet:getByUserId:xxx userSet:getByGroupId:xxx in both directions then role, permission r...
such as the title. even if it can reduce data inconsistencies, it cannot be completely eliminated. Is there any other way to compensate for ? Or what? ...
is the rollback of the transaction a failure of sql execution or a success of sql execution, but will be rolled back if the number of rows affected by additions, deletions and changes is 0? ...
there are three actions in a Service method doSomething { Database write operations redis write call an api } how do I achieve the transactionality or ultimate consistency of this method? if there are only redis and database operations @ T...
I am like this now. The project has a lot of databases, all under the same mysql server, and there is db,db2,db3 in main.php. Now there is a storage operation like this. Table A comes from db2,B table and comes from db3,. When using transactions, it is ...
controller 2018-10-29 21:16:40.997 ERROR 9580 --- [nio-8088-exec-1] o.a.c.c.C.[.[.[ ].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.s...
I test with the simplest code, opens the transaction, inserts data, and rolls back . but the database still inserts new data . my database type is InnoDB so I wonder if that s what it says in the document, pay attention to make sure your dat...
https: zh.wikipedia.org wiki. fail if the response message returned by any participant node in the first phase is "terminated ", or if the coordinator node is unable to get the response messages of all participant nodes before the query timeout o...
executing the following sql, in a while loop will result in the non-execution indicated in the figure. Sql uses the version field to implement optimistic locks. @Transactional(rollbackFor = Exception.class) ...
for example public class ShopServiceImpl{ @Transactional public void do1(){ do2(); } @Transactional public void do2(){ .... } } as in the code above, when do1 calls do2 (), are the @ Transactional,...
is it okay to write transactions like this, and do you need custom exceptions? DB::beginTransaction(); try{ $adminRoleObj = new AdminRole; $result = $adminRoleObj->deleteAdminRole($admin->id); $result = $admin->del...
when you use spring-data-redis to integrate redis, in a spring project and operate on redis through RedisTemplate, you want to package some operations of multiple redistemplate so that other Redis operations may not be inserted. public class Test { @R...
defines a service:UserService where a method is defined as follows: @Transactional(propagation = Propagation.REQUIRES_NEW) public void saveException(User user){ userDao.save(user); throw new RuntimeException(""); } if I call this met...
hi, Hello, everyone. there are now ten pieces of data that need to be inserted and ten pieces of data that need to be updated. The data that needs to be inserted in suspense is a1memery a2magina3.a10, and the data that needs to be updated is b1memb2rec...
such as the title, recently, when I was reading some articles on distributed transactions, I saw some nouns, such as TCC and 2PC , but after reading them for a long time, I felt that the two seemed to be about the same. I can t see the difference. I hop...
what is the locking mechanism of mysql transaction serialization isolation level Open transactions in both An and B clients, if 1 if A transaction deletes a record (), B transaction cannot read deleted and uncommitted transactions in A transaction not...
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consult data: 1. MySQL transactions are isolated, and the intermediate state in the transaction process is not visible; 2. MySQL dirty reading means that a transaction is making changes to a record, and the data of this record is in an inconsistent st...
the opening and display on Wechat is abnormal, and the opening of other browsers is normal . < meta name= "viewport " content= "width=device-width,initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no " > <meta name=&quo...
premise: due to the rich product information, ui is roughly divided into two types, so in the .vue file, a large number of v-if are used to control the display of the layout. (it is basically 2 chunks, and each time one of them is displayed, the element...
problem description In the react project, when configuration information is injected into pages that need to use JS-SDK, the console prints: wx is not defined no-undef what to do? the environmental background of the problems and what methods yo...
there is a Uploads directory under the root directory, which can be correctly identified by accessing the image files through url, but non-image files will prompt that the Uploads controller does not exist, what?? What logic? xxxxx.com Uploads proje...
< H2 > Front end is UE4, downloading large files from my nginx server through http protocol. File transfer must be encrypted using base64. Baidu has many transmission methods on the Internet. These methods are all aimed at the case that the front end...